Chapter 3. I/O PORT
3.2.3 Data Register(R1)
R1 Data Register(R1) is 8-bit register to store data of port R1. When set as the output
state by R1DD, and data is written in R1, data is output into R1 pin.
The initial value of R1 is unknown in reset state.
bit
7
6
5
4
3
2
1
0
R17
R16
R15
R14
R13
R12
R11
R10
R1
<00C2H>
initial value
R/W
X
R/W
X
X
X
X
X
X
X
R/W
R/W
R/W
R/W
R/W
R/W
R/W
3.2.4 Port R1 Open drain Assign Register (R1ODC)
bit
7
6
5
4
3
2
1
0
R17OD
R16OD
R15OD
R14OD
R13OD
R12OD
R11OD
R10OD
R1ODC
<00DEH>
initial value
R/W
0
W
0
0
0
0
0
0
0
W
W
W
W
W
W
W
Port R1 Open Drain Assign Register(R1ODC) is 8bit register, and can assign R1 port as
open drain output port each bit, if corresponding port is selected as output. If R1ODC is
¡ È ¡ È
¡ È ¡ È
, port R1 is open drain output, and if selected as 0 , it is push-pull
selected as
1
¡ È
¡ È
output. R1ODC is write-only register and initialized as 00H in reset state.
3 - 3
HYNIX [ HYNIX SEMICONDUCTOR ]
